Mobile communication system, base station apparatus, and method to reduce inter-cell interference for same

Abstract

To improve throughput of the whole system while reducing power consumption. In a mobile communication system comprising a mobile station apparatus and a base station apparatus, the base station apparatus creates an interference information table based on channel quality of an uplink channel, and at the same time, transmitting the interference information indicator table to the mobile station apparatus, and the mobile station apparatus determines a state of interference in an uplink frequency band based on the interference information indicator table, determines a frequency band of a measurement pilot channel, which is a pilot channel used to determine received quality, and make a request to the base station apparatus for a transmission resource. For example, the mobile station apparatus determines a frequency band with lowest interference among the uplink frequency bands as a frequency band of the measurement pilot channel.

1. A mobile communication system comprising:
 a mobile station apparatus; and 
 a base station apparatus, wherein
 said base station apparatus:
 divides an uplink channel frequency band into a predetermined number of bands; 
 creates an interference information indicator table wherein indicators that respectively correspond to said divided uplink channel frequency bands each provide a magnitude relationship value selected from a predetermined plurality of magnitude relationship values based on uplink channel quality, the uplink channel quality being an amount of interference in the respective uplink channel; and 
 transmits said interference information indicator table to another base station apparatus; and 
 
 said mobile station apparatus performs a data transmission in accordance with a transmission resource allocated by said another base station based on said interference information indicator table. 
 
 
     
     
       2. A mobile communication system comprising:
 a mobile station apparatus; and 
 a base station apparatus, wherein
 said base station apparatus:
 divides an uplink channel frequency band into a predetermined number of bands; and 
 creates an interference information indicator table that is transmitted to another base station apparatus wherein indicators that respectively correspond to said divided uplink channel frequency bands each provide a magnitude relationship value selected from a predetermined plurality of magnitude relationship values based on uplink channel quality, the uplink channel quality being an amount of interference in the respective uplink channel; and 
 
 said mobile station apparatus performs a data transmission in accordance with a transmission resource allocated by said another base station based on said interference information indicator table. 
 
 
     
     
       3. The mobile communication system according to  claim 1  or  claim 2 , wherein
 said channel quality is acquired based on a pilot signal for measurement and/or a pilot signal for demodulation received from said mobile station apparatus. 
 
     
     
       4. The mobile communication system according to  claim 1  or  claim 2 , wherein
 said interference information indicator table is created using SIR (Signal-to-Interference Ratio), SINR (Signal-to-Interference plus Noise Ratio), or CIR (Carrier-to-Interference Ratio) in an uplink channel as said channel quality. 
 
     
     
       5. A base station apparatus that communicates with a mobile station apparatus, said base station apparatus:
 dividing an uplink channel frequency band into a predetermined number of bands; 
 creating an interference information indicator table wherein indicators that respectively correspond to said uplink channel divided frequency bands each provide a magnitude relationship value selected from a predetermined plurality of magnitude relationship values based on uplink channel quality, the uplink channel quality being an amount of interference in the respective uplink channel; 
 transmitting said interference information indicator table to another base station apparatus; and, 
 if an interference information indicator table is received from said another base station, permitting allocation of a transmission resource to be based on the received interference information indicator table. 
 
     
     
       6. A communication method of a base station apparatus that communicates with a mobile station apparatus, the method comprising:
 creating an interference information indicator table wherein indicators that respectively correspond to divided uplink channel frequency bands each provide a magnitude relationship value selected from a predetermined plurality of magnitude relationship values based on uplink channel quality, said divided uplink channel frequency bands being obtained by dividing an uplink channel frequency band into a predetermined number of bands, the uplink channel quality being an amount of interference in the respective uplink channel; 
 transmitting said interference information indicator table to another base station apparatus; and, 
 if an interference information indicator table is received from said another base station, permitting allocation of a transmission resource to be based on the received interference information indicator table.